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我系74級革命师生在开門办学中,用我系仪表車間制造的“T—10—73”型地下金属管綫探測仪在张家口市探測地下坑道的位置(以及深度),获得成功。为了貫彻伟大領袖毛主席关于“深挖洞、广积粮、不称霸”的指示,张家口市人民在党的統一領导下,大搞群众运动,經过几年的努力,挖成了纵横全市的地下防空体系。該市防空洞是由地下掏土挖成的,特点是:坑道深(一般可达8米,最深可达15米以上),曲折多。因此,从地面上难于确知各处地下坑道的位置和走向,因此曾发生过事先未弄清
I was the successor of the 74th grade revolutionary teachers and students who opened the door to run the “T-10-73” underground metal pipeline detector made by our instrument workshop to detect the location (and depth) of the underground tunnel in Zhangjiakou City. In order to carry out the instructions of Chairman Mao, the great leader, on “digging deep holes, widening grain and not seeking hegemony”, the people of Zhangjiakou City vigorously engaged in the mass movement under the unified leadership of the party. After several years of hard work, they dug into vertical and horizontal The city’s underground air defense system. The city’s air-raid shelter is excavated from the underground digging, characterized by: deep tunnel (generally up to 8 meters, the deepest up to 15 meters), more twists and turns. Therefore, it is difficult to ascertain the location and direction of the underground tunnels from the ground. Therefore, it has not been known in advance